Combined die for forming step part of short-step bolt

Abstract

The utility model relates to the technical field of fastener production, in particular to a combined die for forming a step part of a short-step bolt, which comprises a die sleeve and a mounting component. The mounting assembly comprises a pre-tightening sleeve, a second mold sheet, a top mold, a buffer block, a buffer spring, an abutting block and a threaded sleeve, the pre-tightening sleeve is slidably mounted on one side of the mold sleeve, the second mold sheet is fixedly mounted on one side, away from the mold sleeve, of the pre-tightening sleeve, the top mold is in threaded connection with the pre-tightening sleeve and is slidably connected with the mold sleeve, and the threaded sleeve is in threaded connection with the mold sleeve and is slidably connected with the top mold; an abutting block is fixedly connected with a threaded sleeve and slidably connected with a die sleeve, a buffer block is fixedly connected with a top die and slidably connected with the die sleeve, one end of a buffer spring is connected with the buffer block, and the other end of the buffer spring is connected with the threaded sleeve, so that the use effect of the die is affected.

Description

Technical Field

[0001] The utility model relates to the technical field of fastener production, in particular to a combined die for forming the step part of a short-step bolt. Background Art

[0002] A short-step bolt, also known as a stepped bolt or step screw, is a high-strength threaded connector with a special design, usually composed of a screw rod, a washer and a nut. During the production process of the short-step bolt, a cold heading processing method is used for processing. During the cold heading forming process of the die, it is easy to cause damage to the die. The usual die is an integral type. During the process of replacing the die, it is time-consuming and laborious, and it is inconvenient to replace the damaged part of the die, thus affecting the use effect of the die.

[0003] The prior art CN210231228U discloses a stepped bolt die, including a threaded sleeve, a die sleeve, a top die, a chamfering die, a first die piece, a second die piece and a pre-tightening sleeve. Loosen the threaded sleeve to separate the threaded sleeve from the die sleeve, take out the top die, chamfering die, first die piece, second die piece and pre-tightening sleeve from the die sleeve for replacement, place the pre-tightening sleeve, second die piece, first die piece, chamfering die and top die in the die sleeve, tighten the threaded sleeve and abut against the top die, and install the pre-tightening sleeve, second die piece, first die piece, chamfering die and top die in the die sleeve, so that it is convenient to replace the damaged part of the die, thereby improving the use effect of the die.

[0004] During normal use, in the prior art during the cold heading forming process, the second die piece is easily damaged under the pressure of cold heading forming, so that the second die piece needs to be frequently replaced, thus affecting the use effect of the die. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a combined die for forming the step part of a short-step bolt, which solves the problem that in the prior art during the cold heading forming process, the second die piece is easily damaged under the pressure of cold heading forming, so that the second die piece needs to be frequently replaced, thus affecting the use effect of the die.

[0006] To achieve the above object, the present utility model provides a combined die for forming the stepped portion of a short-step bolt, comprising a die sleeve and a mounting assembly; the mounting assembly includes a pre-tightening sleeve, a second die piece, a top die, a buffer block, a buffer spring, a resisting block and a threaded sleeve. The pre-tightening sleeve is slidably mounted on one side of the die sleeve, the second die piece is fixedly mounted on the side of the pre-tightening sleeve away from the die sleeve, the top die is threadedly connected to the pre-tightening sleeve and slidably connected to the die sleeve, the threaded sleeve is threadedly connected to the die sleeve and slidably connected to the top die, the resisting block is fixedly connected to the threaded sleeve and slidably connected to the die sleeve, the buffer block is fixedly connected to the top die and slidably connected to the die sleeve, one end of the buffer spring is connected to the buffer block, and the other end of the buffer spring is connected to the threaded sleeve.

[0007] Wherein, the die sleeve has a first internal thread, the first internal thread is located on the side of the die sleeve close to the threaded sleeve and cooperates with the threaded sleeve; the threaded sleeve has a first external thread, the first external thread is located on the side of the threaded sleeve close to the first internal thread and cooperates with the first internal thread.

[0008] Wherein, the pre-tightening sleeve has an internal threaded hole, the internal threaded hole is located on the side of the pre-tightening sleeve close to the second die piece and cooperates with the top die; the top die has a second external thread, the second external thread is located on the side of the top die close to the internal threaded hole and cooperates with the second external thread.

[0009] Wherein, the mounting assembly further includes a limiting frame and a limiting block, the limiting frame is fixedly connected to the die sleeve and is located on the side of the die sleeve close to the top die; the limiting block is fixedly connected to the top die and is slidably connected to the limiting frame.

[0010] Wherein, the limiting frame has a sliding groove, the sliding groove is located on the side of the limiting frame close to the limiting block and cooperates with the limiting block.

[0011] For the combined die for forming the stepped portion of a short-step bolt of the present utility model, place the pre-tightening sleeve, the second die piece and the top die in the die sleeve, tighten the threaded sleeve, the first external thread cooperates with the first internal thread to mount the threaded sleeve on the die sleeve, the threaded sleeve mounts the buffer spring between the buffer block and the threaded sleeve, and disassemble it vice versa. During the processing, under the action of cold heading forming, the pre-tightening sleeve and the second die sleeve drive the top die and the buffer block to move on the die sleeve, the buffer spring deforms under the action of the buffer block, and the buffer block abuts against the resisting block to form a buffer during the processing, avoiding damage to the second die piece under the pressure of cold heading forming, thereby improving the use effect of the die. Description of the Drawings

[0012] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art.

[0013] Figure 1 It is a schematic diagram of the overall structure of a combined mold for forming the stepped part of a short-step bolt in the first embodiment of the present utility model.

[0014] Figure 2 It is a schematic diagram of the structure of the mold sleeve and the top mold of the present utility model.

[0015] Figure 3 It is a schematic diagram of the structure of the limiting frame and the limiting block of the present utility model.

[0016] Figure 4 It is a schematic diagram of the structure of the top mold and the limiting block of the present utility model.

[0017] In the figure: 101 - mold sleeve, 102 - pre-tightening sleeve, 103 - second mold piece, 104 - top mold, 105 - buffer block, 106 - buffer spring, 107 - abutting block, 108 - threaded sleeve, 109 - first internal thread, 110 - first external thread, 111 - internal thread hole, 112 - second external thread, 201 - limiting frame, 202 - limiting block, 203 - sliding groove. Specific embodiments

[0018] The following will describe in detail the embodiments of the present utility model. The examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation to the present utility model.

[0019] The first embodiment of the present application is as follows:

[0020] Please refer to Figure 1 and Figure 2 , Figure 1 It is a schematic diagram of the overall structure of a combined mold for forming the stepped part of a short-step bolt in the first embodiment of the present utility model, Figure 2It is a structural schematic diagram of the die sleeve and the top die of the present utility model. The present utility model provides a combined die for forming the stepped part of a short-step bolt, which includes a die sleeve 101 and an installation component; the installation component includes a pre-tightening sleeve 102, a second die piece 103, a top die 104, a buffer block 105, a buffer spring 106, a resisting block 107 and a threaded sleeve 108. The die sleeve 101 has a first internal thread 109, the threaded sleeve 108 has a first external thread 110, the pre-tightening sleeve 102 has an internal threaded hole 111, and the top die 104 has a second external thread 112. Through the above-mentioned solution, the problem in the prior art that during the cold heading forming process, the second die piece 103 is easily damaged under the pressure of cold heading forming, so that the second die piece 103 needs to be frequently replaced, thus affecting the use effect of the die, is solved. It can be understood that the above-mentioned solution can be used in the case where in the prior art during the cold heading forming process, the second die piece 103 is easily damaged under the pressure of cold heading forming.

[0021] For this specific embodiment, by placing the pre-tightening sleeve 102, the second die piece 103, and the top die 104 in the die sleeve 101 and tightening the threaded sleeve 108, the threaded sleeve 108 installs the buffer spring 106 between the buffer block 105 and the threaded sleeve 108, and vice versa for disassembly. During the processing, under the action of cold heading forming, the pre-tightening sleeve 102 and the second die sleeve 101 drive the top die 104 and the buffer block 105 to move on the die sleeve 101. The buffer spring 106 deforms under the action of the buffer block 105, and the buffer block 105 abuts against the resisting block 107, forming a buffer during the processing to avoid damage to the second die piece 103 under the pressure of cold heading forming, thereby improving the use effect of the die.

[0022] Among them, the pre-tightening sleeve 102 is slidably installed on one side of the die sleeve 101, the second die piece 103 is fixedly installed on the side of the pre-tightening sleeve 102 away from the die sleeve 101, the top die 104 is threadedly connected to the pre-tightening sleeve 102 and slidably connected to the die sleeve 101, the threaded sleeve 108 is threadedly connected to the die sleeve 101 and slidably connected to the top die 104, the abutting block 107 is fixedly connected to the threaded sleeve 108 and slidably connected to the die sleeve 101, the buffer block 105 is fixedly connected to the top die 104 and slidably connected to the die sleeve 101, one end of the buffer spring 106 is connected to the buffer block 105, the other end of the buffer spring 106 is connected to the threaded sleeve 108, the right end of the die sleeve 101 is hollow, the inner side of the right end of the die sleeve 101 is designed with a first internal thread, the left end of the pre-tightening sleeve 102 is hollow, the right end of the pre-tightening sleeve 102 is designed with an internal threaded hole, the end of the second die piece 103 is designed with a through hole, the outer side of the second die piece 103 is fixedly connected to the right part of the inner side of the pre-tightening sleeve 102, the center position of the left end of the top die 104 is designed with a processing hole, the outer side of the left end of the top die 104 is designed with a second external thread, the second external thread of the top die 104 is connected to the internal threaded hole of the pre-tightening sleeve 102, the outer side of the left end of the top die 104 is slidably connected to the inner side of the die sleeve 101, the outer side of the left end of the threaded sleeve 108 is designed with a first external thread, the right end of the threaded sleeve 108 is designed with a sliding hole, the first external thread of the threaded sleeve 108 is connected to the first internal thread of the die sleeve 101, the sliding hole of the threaded sleeve 108 is slidably connected to the outer side of the right end of the top die 104, the end of the abutting block 107 is hollow, the right end of the abutting block 107 is fixedly connected to the left end of the threaded sleeve 108, the end of the buffer block 105 is hollow, the buffer block 105 is located in the middle of the outer side of the top die 104, the buffer spring 106 is located between the buffer block 105 and the threaded sleeve 108. By placing the pre-tightening sleeve 102, the second die piece 103, and the top die 104 in the die sleeve 101 and tightening the threaded sleeve 108, the threaded sleeve 108 installs the buffer spring 106 between the buffer block 105 and the threaded sleeve 108, and vice versa for disassembly. During the processing, under the action of cold heading forming, the pre-tightening sleeve 102 and the second die sleeve 101 drive the top die 104 and the buffer block 105 to move on the die sleeve 101. The buffer spring 106 deforms under the action of the buffer block 105, and the buffer block 105 abuts against the abutting block 107 to form a buffer during the processing, avoiding damage to the second die piece 103 under the pressure of cold heading forming, thereby improving the use effect of the mold.

[0023] Secondly, the die sleeve 101 has a first internal thread 109 which is located on the side of the die sleeve 101 close to the thread sleeve 108 and mates with the thread sleeve 108. The thread sleeve 108 has a first external thread 110 which is located on the side of the thread sleeve 108 close to the first internal thread 109 and mates with the first internal thread 109. The first internal thread 109 is located inside the right end of the die sleeve 101, and the first external thread 110 is located outside the left end of the thread sleeve 108. By rotating the thread sleeve 108, the first external thread 110 mates with the first internal thread 109, and the thread sleeve 108 is installed on the die sleeve 101, thereby realizing the connection between the thread sleeve 108 and the die sleeve 101.

[0024] Then, the pre-tightening sleeve 102 has an internal thread hole 111 which is located on the side of the pre-tightening sleeve 102 close to the second die piece 103 and mates with the top die 104. The top die 104 has a second external thread 112 which is located on the side of the top die 104 close to the internal thread hole 111 and mates with the second external thread 112. The internal thread hole 111 is located at the right end of the pre-tightening sleeve 102, and the second external thread 112 is located outside the left end of the top die 104. By rotating the pre-tightening sleeve 102, the internal thread hole 111 mates with the second external thread 112, and the pre-tightening sleeve 102 is installed on the top die 104, thereby realizing the connection between the pre-tightening sleeve 102 and the top die 104.

[0025] When using the combined die for forming the stepped part of a short-step bolt according to this embodiment, place the pre-tightening sleeve 102, the second die piece 103, and the top die 104 in the die sleeve 101, tighten the thread sleeve 108, the first external thread 110 mates with the first internal thread 109, and install the thread sleeve 108 on the die sleeve 101. The thread sleeve 108 installs the buffer spring 106 between the buffer block 105 and the thread sleeve 108, and vice versa for disassembly. During the processing, under the action of cold heading forming, the pre-tightening sleeve 102 and the second die sleeve 101 drive the top die 104 and the buffer block 105 to move on the die sleeve 101. The buffer spring 106 deforms under the action of the buffer block 105, and the buffer block 105 abuts against the abutting block 107, forming a buffer during the processing to prevent the second die piece 103 from being damaged under the pressure of cold heading forming, thereby improving the use effect of the die.

[0026] The second embodiment of this application is as follows:

[0027] Please refer to Figure 3 andFigure 4 , Figure 3 is a schematic structural view of the limiting frame and the limiting block of the present utility model, Figure 4 is a schematic structural view of the top die and the limiting block of the present utility model. On the basis of the first embodiment, the installation assembly of this embodiment further includes a limiting frame 201 and a limiting block 202, and the limiting frame 201 has a sliding groove 203.

[0028] For this specific embodiment, when the top die 104 moves, it drives the limiting block 202 to move on the limiting frame 201, thereby restricting the moving angle of the top die 104.

[0029] Among them, the limiting frame 201 is fixedly connected to the die sleeve 101 and is located on the side of the die sleeve 101 close to the top die 104; the limiting block 202 is fixedly connected to the top die 104 and is slidably connected to the limiting frame 201. A plurality of installation grooves are designed on the inner side of the right end of the die sleeve 101, and a sliding groove is designed at the end of the limiting frame 201. There are a plurality of limiting frames 201, and the outer side of the closed end of the limiting frame 201 is fixedly connected to the installation groove of the die sleeve 101. There are a plurality of limiting blocks 202, and the limiting blocks 202 are located on the outer side of the left end of the top die 104. The limiting blocks 202 are slidably connected to the sliding groove of the limiting frame 201. When the top die 104 moves, it drives the limiting block 202 to move on the limiting frame 201, thereby restricting the moving angle of the top die 104.

[0030] Secondly, the limiting frame 201 has a sliding groove 203. The sliding groove 203 is located on the side of the limiting frame 201 close to the limiting block 202 and cooperates with the limiting block 202. The sliding groove 203 is located at the end of the limiting frame 201, and the sliding groove 203 is slidably connected to the outer side of the limiting block 202. When the top die 104 drives the limiting block 202 to move on the sliding groove 203, the connection between the limiting block 202 and the limiting frame 201 is realized.

[0031] When using the combined die for forming the step part of the short-step bolt of this embodiment, when the top die 104 moves, it drives the limiting block 202 to move on the sliding groove 203, thereby restricting the moving angle of the top die 104.

[0032] The above-disclosed are only one or more preferred embodiments of the present application, and the scope of rights of the present application cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present application still fall within the scope covered by the present application.

Claims

1. A combined mold for forming the stepped part of a short-step bolt, including a die sleeve, characterized in that, it further includes a mounting assembly; The mounting assembly includes a pre-tightening sleeve, a second die piece, a top die, a buffer block, a buffer spring, a resisting block and a threaded sleeve. The pre-tightening sleeve is slidably mounted on one side of the die sleeve. The second die piece is fixedly mounted on the side of the pre-tightening sleeve away from the die sleeve. The top die is threadedly connected to the pre-tightening sleeve and slidably connected to the die sleeve. The threaded sleeve is threadedly connected to the die sleeve and slidably connected to the top die. The resisting block is fixedly connected to the threaded sleeve and slidably connected to the die sleeve. The buffer block is fixedly connected to the top die and slidably connected to the die sleeve. One end of the buffer spring is connected to the buffer block, and the other end of the buffer spring is connected to the threaded sleeve.

2. The combined mold for forming the stepped part of a short-step bolt according to claim 1, characterized in that, The die sleeve has a first internal thread, which is located on the side of the die sleeve close to the threaded sleeve and cooperates with the threaded sleeve; the threaded sleeve has a first external thread, which is located on the side of the threaded sleeve close to the first internal thread and cooperates with the first internal thread.

3. The combined mold for forming the stepped part of a short-step bolt according to claim 1, characterized in that, The pre-tightening sleeve has an internal threaded hole, which is located on the side of the pre-tightening sleeve close to the second die piece and cooperates with the top die; the top die has a second external thread, which is located on the side of the top die close to the internal threaded hole and cooperates with the second external thread.

4. The combined mold for forming the stepped part of a short-step bolt according to claim 1, characterized in that, The mounting assembly further includes a limiting frame and a limiting block. The limiting frame is fixedly connected to the die sleeve and is located on the side of the die sleeve close to the top die; the limiting block is fixedly connected to the top die and is slidably connected to the limiting frame.

5. The combined mold for forming the stepped part of a short-step bolt according to claim 4, characterized in that, The limiting frame has a sliding groove, which is located on the side of the limiting frame close to the limiting block and cooperates with the limiting block.

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